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Gas Specifications
Pressure Source Medium: Clean Dry Air or Industrial Grade Nitrogen, 99.5% pure
Pressure Source Particle Size Contamination:
Pressure Source Max. Moisture Content:
Pressure Source Max. Hydrocarbon Content:
Mode
1
Precision
Stability; Over 3 Months:
Over 1 Year:
Zeroing Vacuum Sensor
Active Control Stability
2
Control Low Limit
3
Zero Drift
Standard Load Volume
4
Total Uncertainty
(Aeronautical Units)
4
Total Uncertainty
(Engineering Units)
Rate of Climb
Rate of Climb Tolerance
1
Precision is defined as the combined effect of linearity, repeatability, and hysteresis throughout the
operating temperature range. Some manufacturers use the word "Accuracy" in place of "Precision",
however the meaning is identical.
2
Requires vacuum pump to control 0 psig, or the vent mode can be used to obtain 0 psig.
3
Zero drift typically improves with sensor age.
4
Total Uncertainty is defined as the two sigma combined uncertainty of linearity, hysteresis, repeatability,
thermal effects one year drift stability and the uncertainty in the Fluke primary standard, which include the
uncertainty from NIST.
5
The controller will control rates greater than 6000 ft/min, but its ability to do so is not covered by the Rate
of Climb Tolerance specification.
Table A-5. Specifications RUSKA 7750i
From 25% to 100% of FS: 0.005% of Reading
Below 25% FS: 0.005% of 25% FS
± 10 mtorr at = 100 mtorr, ± 10% RDG at > 100 mtorr
32 inHg a
Sea Level ± 2 ft
30,000 ± 2 ft
60,000 ± 7 ft
32 inHg a
5 ± 0.0008 inHg
15 ± 0.0013 inHg
30 ± 0.0025 inHg
32 ± 0.0030 inHg
1% of commanded rate for altitudes up to 50,000 ft
5% of Commanded Rate for altitudes from 50,000 ft to 70,000 ft
≤ 50 microns
-50 °C dew point
30 ppm
Ps
Absolute
0.0019% RDG/ 3 months
0.0075% RDG/year
0.001% FS
0.3 inHg a (10 mbar a)
<0.002% FS / 24 hrs
3
5 to 60 in
(80 – 1000 cm³)
40 inHg a
Sea Level ± 2 ft
30,000 ± 3 ft
60,000 ± 8 ft
40 inHg a
5 ± 0.0009 inHg
15 ± 0.0014 inHg
30 ± 0.0026 inHg
40 ± 0.0037 inHg
0 to 6,000 ft/min.
Summary of Specifications
Specifications
100 inHg a
Sea Level ± 3 ft
30,000 ± 4 ft
60,000 ± 15 ft
100 inHg a
5 ± 0.0016 inHg
15 ± 0.0019 inHg
30 ± 0.0028 inHg
50 ± 0.0046 inHg
100 ± 0.0092 inHg
A
A-7
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